forked from flanchan/doushio
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71 lines
1.4 KiB
71 lines
1.4 KiB
<?php
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require_once "/main.inc";
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define("CHUNKSIZE", 512);
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function imagexy($im)
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{
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return array(imagesx($im), imagesy($im));
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}
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class ImageScrambler
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{
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public $source=null;
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public $seed=null;
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public function __construct($image, $rndr)
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{
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$this->source=$image;
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$this->seed = $rndr;
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srand($rndr);
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}
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private function getAreas()
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{
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$v = imagexy($this->source);
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$xv = $v[0] % CHUNKSIZE;
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$yv = $v[1] % CHUNKSIZE;
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$ret = array();
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$i=0;
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for($y=0;$i<$yv;$y++)
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{
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for($x=0;$x<$xv;$x++)
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{
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$ret[$i++] = array($x*CHUNKSIZE, $y*CHUNKSIZE,CHUNKSIZE,CHUNKSIZE);
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}
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}
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return $ret;
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}
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private function _swap($ar,$i,$j)
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{
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$cp = $ar[$i];
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$ar[$i] = $ar[$j];
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$ar[$j] = $cp;
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}
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private function scrambleArea($ar)
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{
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for($i=count($ar)-1;$i>=0;$i--)
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{
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$this->_swap($ar, $i, rand(0, $i));
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}
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return $ar;
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}
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public function scramble()
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{
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$area = $this->getAreas();
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$sarea = $this->scrambleArea($area);
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$nw = imagecreate(imagesx($this->source), imagesy($this->source));
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for($i=0;count($area);$i+=2)
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{
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imagecopy($nw, $this->source, $sarea[$i+1][0], $sarea[$i+1][1], $sarea[$i][0], $sarea[$i][1],CHUNKSIZE,CHUNKSIZE);
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}
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imagedestroy($this->source);
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$this->source=$nw;
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return $sarea;
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}
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public function destroy()
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{
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imagedestroy($this->$source);
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}
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}
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?>
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